23 Variation of Domain StructurebDomain walls are shifted when crystal is annealed above TCO→ Domains are mobile!! (though we have not succeeded in control by electric fields)

24 Summary 1. Dip-shape anomaly in IR spectrum:▬ assigned to the overtone of molecular vibrations▬ The activation is attributed to the anharmonic emv coupling associated with charge disproportionation2. Activation of SHG along with CO in α-(ET)2I3▬ verifies our hypothesis derived from the study of the overtone▬ unambiguous proof of the generation of spontaneous polarization3. Observation of SHG interference in α-(ET)2I3▬ Ferroelectric domains are visualized for the first time▬ Large domains: P is screened by residual charge carriers▬ Mobility of domain walls is demonstrated